commit 6ed6afa37f4fd7dc6340a2a4760cf2041761a94f
Author: Andrew Williams <andy@tensixtyone.com>
Date:   Sat Feb 6 16:10:57 2016 +0000

    Initial commit

diff --git a/domaincheck.go b/domaincheck.go
new file mode 100644
index 0000000..b2b1642
--- /dev/null
+++ b/domaincheck.go
@@ -0,0 +1,60 @@
+package main
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"regexp"
+	"strings"
+	"time"
+
+	"github.com/domainr/whois"
+)
+
+// Expiration Regex
+var expirationRegexp = regexp.MustCompile("expiration(?:\\sdate)?[:]\\s(?P<expiration_date>.*)")
+
+var dateFormats = []string{
+	"01/02/2006",
+	"02-Jan-2006",
+	"01-02-2006",
+}
+
+func main() {
+	if len(os.Args) != 2 {
+		fmt.Println("No domains specified")
+		os.Exit(1)
+	}
+	domain := os.Args[1]
+	fmt.Printf("Checking %s...\n", domain)
+
+	expirydate, err := getDomainExpiry(domain)
+	if err == nil {
+		duration := time.Since(expirydate)
+		fmt.Printf("Expires %s, in %f days\n", expirydate, (-1 * duration.Hours() / 24))
+	} else {
+		fmt.Printf("Error while querying %s: %s\n", domain, err)
+	}
+}
+
+func convertDomainDate(date string) (time.Time, error) {
+	for _, v := range dateFormats {
+		test, err := time.Parse(v, date)
+		if err == nil {
+			return test, nil
+		}
+	}
+	return time.Time{}, errors.New("No conversion format found for " + date)
+}
+
+func getDomainExpiry(domain string) (time.Time, error) {
+	request, _ := whois.NewRequest(domain)
+	response, _ := whois.DefaultClient.Fetch(request)
+	match := expirationRegexp.FindAllStringSubmatch(strings.ToLower(response.String()), -1)
+	if match == nil {
+		return time.Time{}, errors.New("No domain found")
+	}
+	var expdate = match[0][1]
+	date, err := convertDomainDate(expdate)
+	return date, err
+}